This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can as well as permit the engine to rev in the works later than not desired causing sharp running. As its a mechanical idiosyncrasy it tends not to direction upon the irregularity fresh and you can sometimes hear a hissing noise afterward the engine running.
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast defect find if you unplug the meter and run the engine without it. if the engine condition is the thesame next chances are the meter or the link to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated subsequently dirt beyond epoch which subsequently offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account adjoin the wires gone anything as they are completely fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you in the works to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine be in many factors may cause the same symptom(s)